DataSheet.es    


PDF IMP5226 Data sheet ( Hoja de datos )

Número de pieza IMP5226
Descripción 18-Line Plug and Play SCSI Terminator
Fabricantes IMP 
Logotipo IMP Logotipo



Hay una vista previa y un enlace de descarga de IMP5226 (archivo pdf) en la parte inferior de esta página.


Total 6 Páginas

No Preview Available ! IMP5226 Hoja de datos, Descripción, Manual

I M P 5 2 2 16
DATA COMMUNICATIONS
18-Line Plug and Play
SCSI Terminator
The 18-channel IMP5226 SCSI terminator is part of IMP's family of high-
performance SCSI terminators that deliver true UltraSCSI performance.
The BiCMOS design offers superior performance over first generation
linear regulator/resistor based terminators.
IMP's new architecture employs high-speed adaptive elements for each
channel, thereby providing the fastest response possible - typically
35MHz, which is 100 times faster than the older linear regulator termi-
nator approach. The bandwidth of terminators based on the older
regulator/resistor terminator architecture is limited to 500kHz since a
large output stabilization capacitor is required.
The IMP architecture eliminates the external output compensation
capacitor and the need for transient output capacitors while maintaining
pin compatibility with first generation designs. Reduced component
count is inherent with the IMP5226.
The IMP5226 architecture tolerates marginal system designs. A key
improvement offered by the IMP5226 lies in its ability to insure reliable,
error-free communications even in systems which do not adhere to rec-
ommended SCSI hardware design guidelines, such as improper cable
lengths and impedance. Frequently, this situation is not controlled by the
peripheral or host designer.
The IMP5226 can be placed in a sleep mode with a high logic signal. In
the sleep mode the outputs are in a high impedance state. Quiescent cur-
rent is less than 150µA when disabled.
The IMP5226 is a superior pin-for-pin replacement for the LX5226,
LX5207, UC5601/5602 and the UCC5610.
Block Diagrams
Key Features
x Ultra-Fast response for Fast-20 SCSI
x 35MHz channel bandwidth
x Sleep-mode current less than 150µA
— Disconnects terminator from lows
x NO external compensation capacitors
x Compatible with active negation drivers
x Compatible with passive and active terminations
x Approved for use with SCSI 1, 2, 3 and
Ultra SCSI
x Hot-swap compatible
x Pin-for-pin compatible with LX5226, LX5207
and UCC5610
IMP SCSI Terminators
Part Channels
IMP5111
IMP5112
IMP5115
IMP5121
IMP5218
IMP5219
IMP5225
IMP5226
IMP5241
IMP5242
9
9
9
27
9
9
18
18
8
8
Type
SE
SE
SE
SE
SE
SE
SE
SE
SE/LVD
SE/LVD
5226_t06.eps
Term Power
VTERM
Thermal
Limiting
Circuit
Current
Biasing
Circuit
24mA Current
Limiting Circuit
2.85V
DATA OUTPUT
PIN DB (0)
DISCONNECT
1.4V
+
1 of 18 Channels
5226_01.eps

1 page




IMP5226 pdf
I M P 5 2 2 16
Application Information
Cable transmission theory suggests to optimize signal speed and
quality, the termination should act both as an ideal voltage refer-
ence when the line is released (deasserted) and as an ideal
current source when the line is active (asserted). Common active
terminators which consist of linear regulators in series with resis-
tors (typically 110) are a compromise. With coventional linear
terminators as the line voltage increases the amount of current
decreases linearly by the equation;
( )VREF VLINE = I.
R
The IMP5226, with its unique new architecture, applies the max-
imum amount of current regardless of line voltage until the
termination high threshold (2.85V) is reached.
Acting as a near ideal line terminator, the IMP5226 closely repro-
duces the optimum case when the device is enabled. To enable
the device the disconnect pin is pulled LOW. During this mode
of operation, quiescent current is 10mA, and the device will
respond to line demands by delivering 24mA on assertion and by
imposing 2.85V on deassertion.
In order to disable the device, the disconnect pin must be driven
HIGH In the disable mode, the device is in a sleep state with
quiescent current less than 150µA. When disabled, all
outputs are in a high impedance state. Sleep mode can be used
for power conservation or to remove the terminator from the
SCSI chain.
An additional feature of the IMP5226 is its compatibility with
active negation drivers.
Table 1. Power Up/ Power Down Function Table
DISCONNECT
L
H
Open
Outputs
Enabled
HI Z
HI Z
Maximum Quiescent
Current
15mA
150µA
150µA
5226_t04.eps
Daily Silver IMP
Data Communications
5

5 Page










PáginasTotal 6 Páginas
PDF Descargar[ Datasheet IMP5226.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
IMP522Dual EL Lamp DriverIMP  Inc
IMP Inc
IMP522518-Line Plug and Play SCSI TerminatorIMP
IMP
IMP522618-Line Plug and Play SCSI TerminatorIMP
IMP

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar